Tommy Fleetwood tied for 12th at the Open Championship.
Instead of paying the world's No 11-ranked golfer for his 12th-equal finish at Carnoustie, US$154,480 (NZ$230,000) was direct-credited to American club pro Tommy Fleetwood, a past player on the European Tour, the Telegraph reported.
U.S. player Tommy Fleetwood, born in 1959, discovered the unexpected windfall on Wednesday while with his friend Greg Thorner, who tweeted the bank statement showing the six-figure deposit between a $14.37 Walmart supermarket bill and a $16 wire transfer fee.
"I didn't believe him at first but then I watched him log into his account".
Open organizers pay out their prize money in dollars, but the European Tour distributes it using details in their database.
The much older Fleetwood has also been a pro golfer - he's now attempting to get onto the senior tour.
Golf Digest have confirmed that this situation, is, in fact, true and to his enormous credit, Fleetwood is laughing the whole thing off.
Fleetwood returned the money and it went to the British Open finisher. "I tried to get on their senior tour, so they have my [bank] information".
"At least, he can always say he won $150,000 at the Open".
Speaking in St Louis ahead of this week's PGA Championship, world No. 11 Fleetwood said he didn't mind the mistake and saw the amusing side of the mix-up.
"My mother called me to say she's been getting lots of calls from the media", said Florida Tommy Fleetwood "It was an honest mistake". It's a amusing story.
"It's just something I don't really look at but I'll get on top of that".